It's really much to-do about nothing. Your data will be good for your use, even if the Modulus you calculate is a bit off. (You're shooting for a target deflection, so you're not using the Modulus in your design.) It's a bit like tuning to standard, it only make a difference if you're playing with others.
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Rodger Knox, PE
1917 Martin 0-28
1956 Gibson J-50
et al
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